import { ref } from 'vue'
import * as echarts from 'echarts'
export function useBarChart() {
  // 园区收入分析
  // 渲染年度收入分析图表
  const barChart = ref(null); // 关联具体容器盒子标签
  const initBarChart = (parkInfo) => {
    // 创建图表函数
    // 1. 解构图表数据
    const { parkIncome } = parkInfo.value;
    // 2. == 根据业务：准备好的options数据 ==
    const barOptions = {
      tooltip: {
        trigger: "axis",
        axisPointer: {
          type: "shadow",
        },
      },
      grid: {
        // 让图表占满容器
        top: "10px",
        left: "0px",
        right: "0px",
        bottom: "0px",
        containLabel: true,
      },
      xAxis: [
        {
          type: "category",
          axisTick: {
            alignWithLabel: true,
            show: false,
          },
          // x轴绑定数据
          data: parkIncome.xMonth,
        },
      ],
      yAxis: [
        {
          type: "value",
          splitLine: {
            show: false,
          },
        },
      ],
      series: [
        {
          name: "园区年度收入",
          type: "bar",
          barWidth: "10px",
          data: parkIncome.yIncome.map((item, index) => {
            const color =
              index % 2 === 0
                ? new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  { offset: 0.23, color: "#74c0f8" },
                  { offset: 1, color: "rgba(116,192,248,0.00)" },
                ])
                : new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  { offset: 0.23, color: "#ff7152" },
                  { offset: 1, color: "rgba(255,113,82,0.00)" },
                ]);
            return { value: item, itemStyle: { color } };
          }),
        },
      ],
      textStyle: {
        color: "#B4C0CC",
      },
    };
    // 3. 渲染图表
    // barChart.value div 标签对象
    const myBarChart = echarts.init(barChart.value);
    myBarChart.setOption(barOptions);
  };

  return {
    barChart,
    initBarChart
  }
}